Multiple cycles of glacier advance and retreat during the Nantuo (Marinoan) glacial termination in the Three Gorges area

Abstract

The Snowball Earth hypothesis suggests that the sea water had totally been kept frozen for millions of years in Neoproterozoic glaciation, followed by a rapid and catastrophic deglaciation resulting from the elevated concentration of atmospheric CO₂. However, the sedimentary records are not consistent with the Snowball Earth hypothesis. The Nantuo Formation in Three Gorges area is composed of diamictites, sandstones and siltstones. The geochronology and the unconformity with underlying Liantuo Formation indicate that the Nantuo Formation in Three Gorges area may be the partial record (i.e., the final stage) of the Nantuo glaciation. Our studies on sedimentary successions of the Nantuo Formation convince the stepwise transition from the Cryogenia icehouse to the Ediacaran greenhouse, in which multiple glacier advance-retreat cycles rather than a catastrophic termination could be identified.

Keywords

multiple glacier advance-retreat cycles / Neoproterozoic / Three Gorges area / glaciomarine environment / Snowball Earth hypothesis

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Acknowledgements

We thank so much to Prof. Shucheng Xie and two anonymous reviewers for their great constructive comments and corrections to our manuscript. This research was financially supported by the National Basic Research Program of China (Nos. 2011CB808805 and 2009CB21950605), the National Natural Science Foundation of China (Grant Nos. 41172102 and 40772073), SinoPec project (G0800-06-ZS-319) and 111 Project (B08030).

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